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Good and evil always go through life hand in hand. How could they see, recognize, discern? Perhaps it is for this, and people are coming up with fairy tales? By sending his son to a campaign, Chernigov Prince does not know yet what will be faced young Vityaz. A mysterious old man, a messenger brought the bad news: "In the land of the principality appeared unknown force." A couple of friends, a formidable lord-governor, a quick Viking outcast, a former slave and a great hunter to go camping with a fearless prince. Who lived in a dark forest, where the trees cover the moon and the sun, where the fog creeping over the morass conceal the real evil? Who are they, unknown creatures, settled in the swamps? Savage beasts, fierce steppe Pechenegs, or ...?